Internal-combustion engine.



F. H. QUHVIBY. INTERNAL coMBusTloN ENGINE.

APPLICATION FILED MAR. 7. |918.

Patented Oct. 29, 1918.

3 SHEETS-SHEET l.

F. H. QUIMBY. INMERNAI.V COMBUSTION ENGINE.

APPLJCTION FILED MAR. I 1918.

Patented Oot. 29, 1918.

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F. H. QUIMBY. INTERNAL CUMBUSTION ENGINE.

APPLICATION FILED MMI. l. 191s.

1,2397.. I Patented. Oct. 29, 1918,

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Specification of Letters Patent.

INTERNAL-COMBUSTION ENGINE.

Application filed March 7, 1918. Serial No. 221,003.

To all 'whom t may concern:

Be it known that I, FRANK H. QUIMBY, a citizen of the United States,residin at Troy, in the county of Rensselaer and l tate of New York,have invented certain new and useful Improvements in Internal-CombustionEngines, ofwhich the following is a specification, reference being hadtherein to the accompanying drawing.

The invention relates to internal combustion engines and has for itsobject to provide an internal combustion engine, wherein the gaseousmixture from the carbureter will be taken into the engine through thecrank easings, thence through passages of the cylinder casings to theintake valves. The intake valves being operated by means of cams carriedby a cam shaft, said cams being so disposed that they will engage theends of the valve stems and force them .inwardly against the action ofsprings, thereby admitting kgaseous, charges to the combustionchambersof the cylinders of the engine. y

A further object of the invention is to provide a valveactuatingmechanism, wherein the intake valves will be actuated by cams carried bya rotating cam shaft, also to provide means whereby the said cam shaftmay be disposed nearer to, or farther away from the ends of the valvestems, thereby allowing, when the cams engage the ends of the valvestems an increased or diminished amount of gaseous mixture to enter thecombustion chambers of the cylinders.

A further .object of the invention is to provide a valve controlled'mechanism for internal combustion engines, comprising a shaft, having'eccentrics at its ends, said eccentrics being mounted in liXed bearingsand a rotatable cam shaft telescopically, but rotatably mounted on thesame and connections between the cam shaft and the crank shaft, wherebythe cam shaft will be rotated, thereby causing the engagement of thecams with the ends of the valve stems. Also to provide means on theeccentric shaft, whereby the eccentrics may be oscillated in theirbearings so that the cams may be brought closer to or farther away, fromthe ends of the valve stems, so as to increase or diminish the sizeofthe gaseous charge admitted to the cylinders of the engine. It beingunderstood that the location of the valve actuating cams may 'be variedor changed according to the kind of engine to which it is applied. Forpurpose of illustration a four-cycle engine is shown, that is to say,the piston makes four strokes to complete a cycle of operation. However,it

.is obvious that the mechanism may be apratenteaoet. ae, raie. i

ceeds, the invention resides in the details of construction andcombination and arrangement of parts hereinafter described and claimed,it being understood that changes in the precise'embodiment of theinvention herein described may be made within the scope of whatisclaimed without departing from the spirit of the invention.

Figure 1 is a side elevation of the upper end of a four-cylinderinternal combustion engine, showing the valve mechanism applied thereto.y

Fig. 2 is a vertical longitudinal sectional view of la portion of theengine and valve mechanism.

Fig. 3 is a vertical sectional view on line 3-3 of Fig. 2, showing thestarting of the intake stroke.

Fig. 4 is an enlarged detail view of the valve` and actuating mechanism,showing the same in intaking position.

Fig. 5 is an enlarged detail view of the valve mechanism showing theeccentric shaft disposed nearer the ends of the valve stems.

Fig. 6 is a perspective view of the cam sleeve.

Fig. 7 is a perspective view of the eccentric shaft.

Referring to the drawings 1 designates a conventional p form offour-cycle engine, which comprises cylinders a, b, c, and d' Eachcylinder is provided with the usual crank casing 2, said casings arepartitioned from each other by walls 3, however, these walls may beeliminated, if desired. The crank casings are air tight and are soconstructed that they will retain the gaseous mixture when forcedtherein from the carbureter. The gaseous mixture enters the crankcasings through ports 4 in the sides intake manifold being in turnconnected to the carbureter port (not shown) by means of the pipe 6.Threaded into the upper ends of the cylinders as at 7 are cylinder heads8. The cylinder heads 8 are provided with chambers-9 for the receptionof the gaseous mixture from the crank casings 2, which enter the samethrough the passages 10- formed by the walls 11 of the Water coolingjacket 12 of each cylinder. The passages 10 terminatel in registrationwith openings 13 in the walls 14 of the cylinder heads. The upper wall15 of each cylinder head is provided with upwardly and downwardlyextending bosses 416 and 17 forming bearings 18 for the reception of thevalve stems 19. The lower walls 20 of the cylinder heads are providedwith intake vports 21 in which the valves 22 seat. Threaded to the valvestems 19 are sleeves 23 having enlargements 24, which are provided withannular flanges 25 and between the enlargements 24 and theupper walls 15of the cylinder heads coil springs 26 are disposed, these coil springskeep the valves normally in engagement with the valve seats 21. Threadedlupon the valve stems 19, as at 27 are cam engaging members 28 whichcomprise internally threaded sleeve portions 29 and( enlarged camengaging portions 30. The springs 26 are of such a tension that theywill keep the valves 22 in engagement with their respective valve seatsuntil the valves are forcibly opened, by the valve actuating mechanism.

Secured to the sides of the cylinders a and d by means of bolts 31 orbrackets 32, having` bearings 33 in which eccentrics 34 are rockablymounted. The eccentrics 34 are provided with rectangular apertures 35for the reception of the rectangular ends 36 of the rockable shaft 37,said shaft being provided with bearing enlargements 38 and reducedportions 39. The enlargements 38 are provided with lubricant grooves 40,the ends of the rockable shaft having threaded reduced portions 41, oneof said reduced portions being for the reception of a cap plate 42,which is threaded and pinned upon the reduced portion by means of a pin43,the other reduced portion 41l of the shaft 37 receives the operatingarm 44, which is provided with a lug 45 engaging an aperture 46 in theeccentric 34, and being held in said position by lock nuts. Connected tothe arm 44 is a rod 47 which leads to any suitable part of anlautomobileso that the shaft and eccentrics may be easily rocked when it is desiredto dispose the same in various positions relative to the ends of thevalve stems. Telescopically fitting and rotatably mounted upon thebearings 38, of the shaft 37 is a sleeve 47, said sleeve beingprovidedwith cams 48. The cams 48 are keyed to the sleeve 47a by means of thekeys 48*1 andare adapted to'ro'A tate therewith. Thel sleeve is providedwith oil apertures 49, which allow thelilling of the spaces 50 formed bythe reduced portions 39 of the shaft 37 and the rotatable sleeve '47with lubricant, theoil apertures 49 being closed by screws '51." Keyedto the end 52 of the sleeve 47a, by means of a key 53 is a sprocket 54and extending around the sprocket 54 and a Vsprocket 55 which rotateswith the crank shaft 56 is a noiseless chain 57. When the invention isapplied to a fourcycle engine itis necessary that the sprocket be ofsuch a size as to make two complete revolutions to one completerevolution of the sprocket 54, however this may vary according to thetype of engine upon which the device is used. The crank shaft isprovided with the usual cranks 58, to lwhich connecting rods 59 arepivotally secured, the connecting rods are in turn pivotally secured towrist pins 60 of the pistons 61. Spark plugs 62 are threaded into theupper part of the cylinders as at 63 and are controlled by the usualspark control mechanism (not shown).

The operation is asfollows: When the piston starts its intake stroke,the cam 48 will force the valve 22 out of engagement with its seat 21.The sprocket 55 making -two revolutions to one revolution made by thesprocket 54 it is obvious that by the time the piston reaches the end ofits intake stroke, the cam 48 will be in the position ton starts itscompression stroke and when it reaches the end of its compression strokethe cam 48 will be in the position shown in dotted lines at 48", atwhich time the charge is ignited and the piston starts downwardly uponits impulse stroke, when it reaches the end of its impulse stroke, thecam 48 will be in the position as shown at 48. The burnt gases willescape through the exhaust manifold 64, when the same is uncovered bythe piston on its downward impulse stroke. After the impulse stroke andexhausting of burnt gases the piston will move upwardly for the startingof another intake stroke.

It will be seen that when it is desired to iucrease the amount ofgaseous mlxture admitted to the combustion chambers of the cylinders, itcan be easily accomplished by rocking the shaft 39, which is carried bythe .eccentrics `34, thereby loweringthe axis of the rotatable sleeveand consequently bringing the noses of the cams 48 nearer to the ends ofthe valve stems, so that as the cams rotate the valve 22 will be forcedfarther out of engagement with their valve seats and consequently allowa greater amount of the gaseous mixture to enter the combustion chambersof the cylinders.

Lubricant cups 65 are threaded as at 66 into the brackets 32 and furnishlubricant to the eccentric bearings 35.

The invention having been set forth wha lis claimed as new and useful is:--h l. In an internal combustion engine comprising a cylinder, acylinder head secured to said cylinder, a valve carried by said cylinderhead and normally held closed, a rockable shaft disposed over 'the endsof the valve stem, a rotatable sleeve telescopically and rotatablymounted upon the rockable shaft and provided. with a cam rigidly securedthereto and means whereby the cam may be disposed at different distancesfrom the end of the valve stem.

2. In an internal combustion engine co1nprising a cylinder, a cylinderhead secured to said cylinder, a valve carried by saidV cylinder headand normally held closed, a rockable shaft disposed over the end of thevalve stem and having eccentrics at its ends mounted in stationarybearings, a rotatable sleeve telescopically and rotatably mounted u onthe rockable shaft and provided with a rigid posed over the valve stemsand having eccentrics at its ends mounted in'bearings and having reducedportions, a rotatable sleeve telescopically and rotatably mounted uponthe rockable shaft, means for rotating the rotatable shaft, cams rigidlysecured to the rotatable shaft and means whereby the eccentrics may berocked in their bearings so that the cams may be disposed at dierentdistances from the valve stems.

ln testimony whereof I hereunto ax my signature.

FRANK n. QUIMBY.

